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 ###Instrução: Qual é o gênero do ensino médio sênior 26mm?
 ###Tabelas: CREATE TABLE table_of_standard_amino_acid_abbreviations_and_properties (table_of_standard_amino_acid_abbreviations_and_properties_id AUTO_INCREMENT PRIMARY KEY, Amino Acid VARCHAR, 3-Letter VARCHAR, 1-Letter VARCHAR, Side-chain polarity VARCHAR, Side-chain charge (pH 7.4) VARCHAR, Hydropathy index VARCHAR) CREATE TABLE men's_doubles (men's_doubles_id AUTO_INCREMENT PRIMARY KEY, Location VARCHAR, Year INT, Champion VARCHAR, Runner-up VARCHAR, Score VARCHAR) CREATE TABLE regulations (regulations_id AUTO_INCREMENT PRIMARY KEY, Specification VARCHAR, Gender VARCHAR, Junior High School (12–15 yrs) VARCHAR, Senior High School (15–18 yrs) VARCHAR, University students and Adults (18yrs+) VARCHAR) CREATE TABLE head_to_head (head_to_head_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Miles [One Way] INT, Home Result VARCHAR, Fans Brought VARCHAR, Away Result VARCHAR, Fans Took VARCHAR, Points Gained INT) CREATE TABLE doubles:_9_4_titles_5_runner-ups (doubles:_9_4_titles_5_runner-ups_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Year VARCHAR, Tournament VARCHAR, Surface VARCHAR, Partnering VARCHAR, Opponents in the final VARCHAR, Score VARCHAR)  
SELECT Gender FROM regulations WHERE Senior High School (15–18 yrs) = 26mm